250 Part III. — Twenty-second Annual Report 



Remarks. — The more obvious characters by which this species may be 

 distinguished are : the structure and lengths of the female antennules, the 

 three-segmented abdomen, together with the proportional difference in the 

 size of the first segment with the preceding segment of the thorax and 

 the other two abdominal segments ; and lastly, the peculiar form of the 

 fifth pair of thoracic feet, as indicated by the various figures. 



Thaumaleus rostratus, T. Scott, sp. n. PI. xiv., fig. 5-8. 



Description of the Female. — The length of the specimen represented by 

 the drawing (fig. 5) is 3 9 mm. (about T 2 g- of an inch) ; the first 

 cephalothoracic segment is moderately stout, tapering gradually in front 

 into a blunt pointed rostrum; while posteriorly the body becomes 

 gradually narrower towards the distal extremity (fig. 5, pi. xiv.). 



The abdomen is composed of three segments ; the first segment is as 

 large as the next two together, but the second is very small. 



Each of the furcal joints is provided with three setae of moderate 

 lengths, arranged as shown in the drawing (fig. 8, pi. xiv.). 



Antennules short and moderately stout, four-jointed and sparingly 

 setiferous ; the first and third joints are small, the second is about one 

 and a half times the length of the third, while the last is equal to the 

 entire length of the other three joints (fig. 6. pi. xiv.). 



The fifth pair of thoracic feet are short and foliaceous, and each 

 terminates in two unequal lobes ; the outer lobe, which is narrower than 

 the inner and projects somewhat beyond it, is furnished with three 

 moderately long setae ; the inner lobe is broadly rounded and provided 

 with a single seta (fig. 7, pi. xiv.). 



Habitat. — Lerwick Harbour, Shetland, October 15, 1901. Three or 

 four specimens were obtained, all of which were females. 



Remarks. — The form just described is readily distinguished by the 

 produced forehead and by the form and armature of the fifth pair of 

 thoracic feet. 



Fam. Choniostomatid^e, Hansen (1887). 

 Genus Stenothocheres, Hansen (1897). 



Stenothoclieres egregius, H. J. Hansen. PI. xv., fig. 5-10. 



1897. Stenothocheres egregius, Hansen, The Choniostomatidae, 

 p. 89, pi. i., fig. 1 a-e. 



The Sphceronella-YikQ form which I ascribe to Stenothocheres egregius 

 was obtained in the marsupium of Metopa borealis, G. 0. Sars. The 

 female represented by the drawing (fig. 5) measured about '68 mm. in 

 length (nearly '-fa of an inch) ; the body was almost sphaerical in shape, 

 but was rather longer than the height. 



The antennules are small (fig. 7), and the end joint, w T hich is furnished 

 with tw T o moderately long spine-like terminal setae, is about one and a 

 half times as long as the preceding one. 



The antennae are very minute and composed of two sub-equal joints, 

 and they are each armed with a comparatively stout terminal spine (fig. 8). 



The maxillipeds were damaged while being removed for the purpose 

 of mounting, but the second pair, so far as they could be made out, 

 appear to be moderately strong with stout terminal claws as indicated in 

 figure 6. 



The first pair of feet, though very small, are comparatively stout and 

 two-branched, and both branches appear to be two-jointed ; the inner 

 branches are furnished with three apical spines, the middle one being 



